EmissionsSeverity Medium: diagnose soon

P2237O2 Sensor Positive Current Control Circuit/Open (Bank 1 Sensor 1)

What it means

The ECU sees an open circuit on the pump current wire of the upstream wide-band oxygen sensor.

Symptoms

Check engine light
Rough running or higher fuel consumption
Engine may run in open loop

Common causes

Wiring fault on that circuit of the wide-band sensor
Corroded connector
Failed wide-band oxygen sensor
ECU sensor interface fault (rare)

What to check first

Check each wire between the sensor and ECU for continuity and shorts
Check the connector for corrosion
Compare with a known-good sensor's behaviour (lambda reading at idle and on overrun)

Can I drive with P2237? Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.

Generic OBD-II meaning. Manufacturer-specific meanings and checks can differ; always check the service information for the car.

Cases with P2237 (0)

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P2237: questions and answers

What does P2237 mean?

P2237: O2 Sensor Positive Current Control Circuit/Open (Bank 1 Sensor 1). The ECU sees an open circuit on the pump current wire of the upstream wide-band oxygen sensor.

What are the symptoms of P2237?

Check engine light. Rough running or higher fuel consumption. Engine may run in open loop.

What causes P2237?

Wiring fault on that circuit of the wide-band sensor. Corroded connector. Failed wide-band oxygen sensor. ECU sensor interface fault (rare).

How do you diagnose P2237?

1. Check each wire between the sensor and ECU for continuity and shorts 2. Check the connector for corrosion 3. Compare with a known-good sensor's behaviour (lambda reading at idle and on overrun)

Can I drive with P2237?

Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.